A star is moving towards the earth with a speed of `9.0 xx10^(6) ms^(-1)` . If the wavelength of a particular spectral line emitted by it si 6000 `Å` , then find the apparent wavelength.
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The car delivered the cargo from point A to point B, moving at average speed `mu_(1)=40km//h`. Turning back, the car was moving at an average speed of
Correct Answer - D `t_(1)=(x)/(40),t_(2)=(x)/(60)` `v_(av)=(2x)/(t_(1)+t_(2))=(2x)/((x)/(40)+(x)/(60))=(2xx60xx40)/(100)=48km//hr`
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Find Q1 , D5 and P45 for the following data: Monthly Rent 0-500 500-1000 1000-1500 1500-2000 2000-3000 3000-4000 4000-5000 5000-6000 6000-7000
Q1 = 1862.64, D5 = 2666.67, P45 = 2500
2 Answers 1 views
A star is at a distance of `50xx10^(12)` km from earth. If the star disappears due to collision with some other star so that its light is extinguished
Correct Answer - `5.3`years
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The energy of photoelectrons emitted from a sensitive plate is 1.56 eV. If its threshold old wavelength is `2500 Å`, calculate the wavelength of incid
Correct Answer - `1379 Å`
2 Answers 1 views
Calculate the de Broglie wavelength associated with the following : (i) electrons moving with a speed of `10^(5)ms^(-1)` (ii) protons moving with a sp
Correct Answer - `0.7278 xx 10^(-8)m` `3.97 xx 10^(-12) m` `0.29 xx 10^(-10) m` `1.807 Å` `0.1690 Å` `0.01276 Å`
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The spectral line in the spectrum of light from a star is found to be shifted by 0.032% from its normal position towards the red end of the spectrum .
Correct Answer - `96 km s^(-1)`
2 Answers 9 views
A star is moving away from an observer with a speed of `500 kms^(-1)` .Calculate the Doppler shift if the wavelength of light emitted by the star is 6
Correct Answer - Increase of `10Å`
2 Answers 1 views
An electron in an excited hydrogen atom acquired an energy of 12.1 eV. To what energy level did it jump? How many spectral lines may be emitted in the
Correct Answer - `n=3;` 1025 Å, 6563 Å; 1215 Å
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A mass 2m moving with some speed is directly approaching another mass m moving with double speed.
Correct answer is (B) 3/2
2 Answers 25 views
A car is moving towards east with a speed of `25 km h^-1`. To the driver of the car, a bus appears to move towards north with a speed of `25 sqrt(3) k
Correct Answer - 50 km/h`(60^(@)N" of "E)`
2 Answers 1 views